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A coin is considered circulated if it has been used as tender. A coin is considered uncirculated if it has never been used and is in mint condition. There are coins that are very valuable even when they are in poor condition; you will want to avoid cleaning those collectible coins. Cleaned coins can easily be spotted by reputable sellers and are worth significantly less on the market. Coin dealers cannot easily replenish their stocks by having new coins minted; they have to purchase more coins from fellow dealers and collectors.